Remove features for migrating to null safety #3713
Merged
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Dart 3 will only work with already migrated code. 2.19 should be used for any last migrations.
Removing:
dart pub outdated --mode=null-safety
dart pub upgrade --null-safety
We keep the validator that gives a hint if the package you are publishing is the first null safe package - I believe this still makes sense to notify about even in a Dart 3 world.
Part of dart-lang/sdk#50707 .